Lifting device



Aug. '23, 1932.

c. H. CLARK LIFTING DEVICE Filed March 10, 1950 2 Sheets-Sheet 1 Aug. 23, 1932. CLARK 7 1,873,288

LIFT-1N6 DEVICE Filed March 10, 1930 2 Sheets-Sheet 2 Patented Aug. 23, 1932 UNITED STATES cmnms I-I. CLARK, or wesnmeronjnrszrnrcr or COLUMBIA Linrme DEVICE Application filed March 10, 1930. Serial in. 434,755.

This invention relates to a lifting device and aims to provide a device whereby excessive loads may be elevated by manual power with the minimum exertion on the part of the operator. T

The primary object'of the invention is to provide a device of this character including a base, a frame movable ina horizontal plane, mounted on the base, and a power cable con- J nected with the movable frame in such a way that reciprocal movement of the frame will result in a'vertical movement'of the power cable, to accomplish ,the lifting operation.

' An important object of the invention is to 33 provide a frame including pivotally connected bars so arranged and supported that vertical strain on the cable will actto direct lateral strain on the frame, moving the frame into contact with an anchor wheel so that the strain directed ,to the frame by the load lifted, will be transferred'to the anchor wheel and its bearing on a direct line drawn horizontally through the bearing, regardless of the point of contact between the, frame and anchor wheel.

Withthe foregoing and other objects in view, which will appear as the'description proceeds, the invention resides in the coiiubination and arrangement of-parts and in the details of construction hereinaftendescribed Figurejt is a diagram illustrating the man ner of connecting the power cable.

Figure 5 is a diagram illustrating one .of the 'tensioning cables. Figure 6 is .a diagram illustrating another tensioning 'cable, forming a part of the device. a

' Referringto the drawings in detail, the

device comprises a'base indicated generally by the reference character 5, and includesv side bars 6 and 7 respectively and a rear bar 8;; These bars 6 and? are pivotally connected at their forward ends by means of the bolt 9 that'extends through eye members 10 secured to the bars 6 and 7. Thus it. will be seen that due to this construction the side bars 6 and 7 of the frame maybeadjusted towardsand away from each other, to meet various requirements The bar 8 is formed with slots 11, the lower surfaces of theslots'beingformed with notches 12 that receive the pivoted bolts 13 which are secured to the free ends of the bars (land 7, as clearly shown'by Figure 1 of the drawings. 1 f

Nuts 14 are positioned on thebolts 13 and provide means wherebythe'bar 8 maybe drawninto close engagement with the ends of thebars 6 and 7 As shown" by Figure 1;

of the drawings, the bar 6 is substantially wide, throughout a portion of its length, and extends to a position beyond the pivot point between the bars 6 and 7 providing a track or guide for the wheel 14, to be hereinafter more fully described.

Mounted on the bar 7is a bar 15 which'has one end thereof secured to the bar 7 at a point intermediate the ends of the bar7,lthe free end of the bar being spaced an appreciable distance from the bar 7' and held in such position by means of the bar 16.

I Mounted on the base 5 is a movable frame indicated generally by the reference character'17, and as shown this frame comprises a pair of bars pivotallyconnected by means of the bolt 18, the bars being indicated by the reference characters 19 and 20.

Mounted on the forward end of the ban-19 is a wheel 21, the wheel 14 being mounted at the forward end of the bar 20, the wheels acting as guides for the forward ends of the bars 19 and 20 of the movable frame 17. Se} cured to the bar 19 of the frame 17, is a cross bar 22 which is pivotally connected to the bar 19 by means of the bolt 23. A curved slot 24 is formed in the bar 22 at a point adjacent to the bolt 23 and receives the bolt 25 that extendsupwardly from the bar 19, there being provided a nut 26 on the bolt 25 for secur reference character 27 has one of itsends se by the device.

9 around the pulley 44 mounted on the cross bar 22, from which the cable passes around pulley and pin 30.

cured to thecross bar 22, at 28, from where the cable passes over one end'of the cross bar 22 andis looped around the pulley 29 from where it passes-around the pulley 30 and back over the end of the bar 22. The pulleys 29 and 30 are supported on the bar 19, as clearly shown by Figure 1 of the drawings.

I The cable27 engages along one edge of'the bar 22, as -at-31, from where it passes around the opposite vend of the crossbar22. This cable is now passed over the pulley 32 mounted on the bar 20, from where it passes under the bar 19' andover the pulley 33 which is of the swivel type. The pulley 33 is mounted on the bracket 34 that extends laterally from the side bar 6jof thebase. I p

A suitable hook not shown, is secured to the free end of the cable 27 and is designed to be positioned under the article to be lifted A tensioning cableindicated bythe reference character 35 is formed with a loop, 36 at one of its ends to be looped over the pin 37 extending upwardly from the cross bar 22, the cable 35 being then passed around the pin 37, from where it extends laterally and formed into a loop 38 looped around the The cableis now looped around the pulley 29 and is looped over the pin 39 extending from the bar 19, the end of the cable being supplied with a hook 40 which is hooked into one of the links 41 which are clamped-tothe power cable 27. Another tensioning cable is employed for further tensioning the power cable, the latter tensioning cable being indicated by the reference character, '42 which. cable is formed with a loop 43 positioned over the pin 28 from where the cable extends under the cable 27 and around one end of the bar 22, from which the cable extends around the pulley'29 andeis passed around the pulley 30. The cable is new extended laterally. and is looped the pulley 29, the free end of the cable being supplied wit-ha hook 45 to be hooked-in one of the rings 41', securing the-cable 42 to the power cable '27.

- i The anchor wheel 45, forms an important feature. of the invention and is mounted on the shaft 46 that extends upwardly from the bar 6, the wheel 45 being so mounted with respect. to the bar 19, the lateral pressure directed to the bar 19 by the weight of the object being lifted, will be directed to the wheel 45 and its supporting shaft 46, in a dlrect line drawn horizontally through, the

the movable frame.

' crating the device, to reciprocate the movable frameover the base, to accomplish the purpose of the invention. It might be further stated that due to thetensioning cables, the power cable 27 is drawn inwardly to a point beyond the pivot of pulley32, directing a lateral pull on the power cable to swing the forward ends of the bars 19 and 20 inwardly so that the wheels supported at the "front ends thereof, will contact with the base," guiding It is obviousthat as the frame moves over the base, thepower cable is moved vertically to raiseor lower the weight carried at the free end thereof. Iclaim: I I

- 1. A lifting device comprising a base, a

frame movable over the base,.-an anchor wheel mounted on the base and operating in a horizontal plane, said frame engaging the periphery of the wheel to exert-,a lateral pressure on the wheel, a powercable having one of its ends secured to the frame, a pulley on the base over which thecable operates, the free endof thecable being adapted to be secured to the load to belifted, and pulleys on the frame over which the-cable operates, said frame being adapted tobe manually reciprocated.

.2- A lifting devicefcomprisinga base, a movable frame mounted on the base, said frame comprising pivotally connected bars, wheels on the bars and contacting with the base to guide the frame inits movements, an

anchor wheel on the base and against which I the frame moves to exert pressure against the anchor wheels, 3. power cable secured to the frame and movable with the frame, and

a pulley on the. base over which the cable moves to lift an article, said frame being adapted to be movedto. operate'thepower cable. 7 I I 3. A lifting device comprising a base a frame movable over the base, means for guiding the frame in its movements, a wheel mounted on thebase and against which the frame moves, the point of contact between the wheel and frame being on a line drawn horizontally through the wheel, a lifting cable having one end thereof connected with the frame, and a pulley on the base and over which the cable operates, said frame being adapted to be moved over the base to operate the cable.

4. A lifting device comprising a a.

frame mounted for reciprocal movement over the base, said framecomprising pivotally connected bars connected at points intermediate the ends of the bars, said bars being adapted to swing with respect to each other, means at the outer ends of the bars for guiding the frame, an anchor wheel mounted on the base and against which the frame moves, and a cable secured to the frame, said cable moving over one side of the base, to V raise and lower an object connected therewith, and said frame being adapted vto be moved to operate the cable. 1

5. A lifting device comprising a base, a frame mounted on the base and adapted to reciprocate in a horizontal plane, a cross bar carried by the frame, a cable connected with the cross bar, said cable operating over one side of the frame, adjustable means for tensioning the cable at a point adjacent to the cross bar, and a wheel supported by the base and over which the frame moves on its movements with respect to the base.

6. A lifting device comprising a base, a frame mounted on the base, said frame embodying pivotally connected bars, means at the outer ends of the bars for engaging the base to guide the frame in its movements over the base, a cross bar connected with one of the first mentioned bars, a pulley on the cross bar, pulleys on the bar on which the cross bar is mounted, a power cable secured to the cross bar, a pulley on one of the bars of the frame and disposed adjacent to one end of the bar, said power cable operating over the last mentioned pulley to move with the pulley, a pulley on the base and over which the cable operates when the frame is moved over the base, and tensioning cables secured to the cross bar and looped around the first mentioned pulleys and engaging the power cable to tension the power cable.

7 A lifting device comprising a base, said base comprising pivotally connected side members, means for adjusting the side mem- A bers with respect to each other, a frame movable over the base, means for guiding the frame in its movements, said frame embodying pivotally connected bars, a powerrcable connected with the frame, a pulley on the base and over which the power cable opcrates to raise and lower an object, and an anchor wheel on the base over which the frame moves.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature.

CHARLES H. CLARK. 

